Setup DuckDNS and Nginx official Add-Ons. Used the default values for everything. Everything working correctly for external access. The issue is, when access HA locally via local IP:8123, I can login fine, but any Add-Ons that have a UI (e.g. Studio Code Server, zwavejs2mqtt) show a 401 error when I try to access them from within HA. I can use the duckdns address, but if there is an internet outage (or just because it’s faster) I want to be able to access my UI locally.
What do I need to configure differently to get the Add-Ons working as well?